CVE-2025-39939iommu/s390: Fix memory corruption when using identity domain
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: iommu/s390: Fix memory corruption when using identity domain zpci_get_iommu_ctrs() returns counter information to be reported as part of device statistics; these counters are stored as part of the s390_domain. The problem, however, is that the identity domain is not backed by an s390_domain and so the conversion via to_s390_domain() yields a bad address that is zero'd initially and read on-demand later via a sysfs read. These counters aren't necessary for the identity domain; just return NULL in this case. This issue was discovered via KASAN with reports that look like: BUG: KASAN: global-out-of-bounds in zpci_fmb_enable_device when using the identity domain for a device on s390.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 15, 2026
Affected products
Linux Linux linux:linux (from the name) | 64af12c6ec3afd7d44bc8b2044eee59f98059087 builds before 17a58caf3863163c4a84a218a9649be2c8061443; from 64af12c6ec3afd7d44bc8b2044eee59f98059087 before b3506e9bcc777ed6af2ab631c86a9990ed97b474 | CNA record |
linux linux_kernel linux:linux_kernel | from 6.15 before 6.16.9; 6.17; 6.17; 6.17; 6.17; 6.17; 6.17 | NVD |
References
- https://git.kernel.org/stable/c/17a58caf3863163c4a84a218a9649be2c8061443patch
- https://git.kernel.org/stable/c/b3506e9bcc777ed6af2ab631c86a9990ed97b474patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.